EP4244034A1 - Élément mâle d'un moule - Google Patents

Élément mâle d'un moule

Info

Publication number
EP4244034A1
EP4244034A1 EP21806404.6A EP21806404A EP4244034A1 EP 4244034 A1 EP4244034 A1 EP 4244034A1 EP 21806404 A EP21806404 A EP 21806404A EP 4244034 A1 EP4244034 A1 EP 4244034A1
Authority
EP
European Patent Office
Prior art keywords
die
male element
mould
parison
liner
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP21806404.6A
Other languages
German (de)
English (en)
Inventor
Davide BALDISSERRI
Stefano Bergami
Marcello ZAMA
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sacmi Imola SC
Original Assignee
Sacmi Imola SC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sacmi Imola SC filed Critical Sacmi Imola SC
Publication of EP4244034A1 publication Critical patent/EP4244034A1/fr
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/02—Moulds or cores; Details thereof or accessories therefor with incorporated heating or cooling means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/36—Moulds for making articles of definite length, i.e. discrete articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/52—Heating or cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B11/00—Making preforms
    • B29B11/06—Making preforms by moulding the material
    • B29B11/12—Compression moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/04—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles using movable moulds
    • B29C43/06—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles using movable moulds continuously movable in one direction, e.g. mounted on chains, belts
    • B29C43/08—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles using movable moulds continuously movable in one direction, e.g. mounted on chains, belts with circular movement, e.g. mounted on rolls, turntables
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
    • B29C49/0685—Compression blow-moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/08—Biaxial stretching during blow-moulding
    • B29C49/10—Biaxial stretching during blow-moulding using mechanical means for prestretching
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/08—Biaxial stretching during blow-moulding
    • B29C49/10—Biaxial stretching during blow-moulding using mechanical means for prestretching
    • B29C49/12—Stretching rods
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/28—Blow-moulding apparatus
    • B29C49/30—Blow-moulding apparatus having movable moulds or mould parts
    • B29C49/36—Blow-moulding apparatus having movable moulds or mould parts rotatable about one axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/64—Heating or cooling preforms, parisons or blown articles
    • B29C49/6409—Thermal conditioning of preforms
    • B29C49/6427—Cooling of preforms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/64—Heating or cooling preforms, parisons or blown articles
    • B29C49/6409—Thermal conditioning of preforms
    • B29C49/6463—Thermal conditioning of preforms by contact heating or cooling, e.g. mandrels or cores specially adapted for heating or cooling preforms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/64—Heating or cooling preforms, parisons or blown articles
    • B29C49/6409—Thermal conditioning of preforms
    • B29C49/6463—Thermal conditioning of preforms by contact heating or cooling, e.g. mandrels or cores specially adapted for heating or cooling preforms
    • B29C49/6465—Cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/64—Heating or cooling preforms, parisons or blown articles
    • B29C49/6409—Thermal conditioning of preforms
    • B29C49/6463—Thermal conditioning of preforms by contact heating or cooling, e.g. mandrels or cores specially adapted for heating or cooling preforms
    • B29C49/6466—Thermal conditioning of preforms by contact heating or cooling, e.g. mandrels or cores specially adapted for heating or cooling preforms on the inside
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/64—Heating or cooling preforms, parisons or blown articles
    • B29C49/6409—Thermal conditioning of preforms
    • B29C49/6463—Thermal conditioning of preforms by contact heating or cooling, e.g. mandrels or cores specially adapted for heating or cooling preforms
    • B29C49/6467—Thermal conditioning of preforms by contact heating or cooling, e.g. mandrels or cores specially adapted for heating or cooling preforms on the outside
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages

Definitions

  • This invention relates to a male element of a mould, a mould, a forming and blow moulding machine and a method for the compression moulding and blow moulding of a parison.
  • Patent document US10781010B2 also discloses a machine which is configured to form a parison by compression moulding and to blow mould it.
  • Patent document US8790112B2 discloses a machine which is configured to form a parison by injection moulding and to blow mould it.
  • JP2011230293A1 describes a circuit for cooling a male element of a mold which has the sole purpose of cooling the neck of the preform and not the entire preform. Instead, the document EP3666493A1 relates to injection molding.
  • the aim of this disclosure is to provide a male element of a mould, a mould, a forming and blow moulding machine and a method for the compression moulding and blow moulding of a parison to overcome the above mentioned disadvantages of the prior art.
  • This disclosure relates to a male element of a mould.
  • the mould is configured to form a parison.
  • the mould is configured for compression moulding the parison from a previously prepared charge of thermoplastic material; nevertheless, this disclosure might also be applicable to a male element of an injection mould or of an injection-compression mould.
  • the male element is associable with a female element of the mould to delimit a forming cavity in which the parison is formed.
  • the male element may define an upper half mould and the female element may define a lower half mould (or vice versa), movable towards and away from each other between an open position, in which they receive the charge of thermoplastic material, and a closed position, in which they delimit the forming cavity to mould the charge of material to form the parison.
  • the charge is received by the lower half mould.
  • the charge may be propelled onto the lower half mould by a charge propelling machine.
  • the male element comprises a die.
  • the die extends along a longitudinal axis.
  • the male element (or rather, the die) comprises a ducting system located inside the die to allow a cooling fluid to flow in the male element.
  • the cooling fluid may be water, for example.
  • the die comprises a body and a liner fitted round the body.
  • the body has an outside surface facing towards the liner.
  • the liner has an outside surface, acting in conjunction with the female element of the mould to delimit the forming cavity, and an inside surface which is in contact with the outside surface of the body.
  • the ducting system is formed between the body and the liner.
  • the ducting system is (or comprises one or more ducts which are) delimited by respective portions of the body and of the liner in mutual contact.
  • either one (or both) of the inside surface of the liner and the outside surface of the body is (are) grooved, to form the ducting system (that is, to form the one or more ducts of the ducting system).
  • the body extends along the longitudinal direction to a body tip, which is operatively oriented towards the female element of the mould.
  • the body has a first portion, with a first diameter, and a second portion, with a second diameter smaller than the first diameter, wherein the second portion is proximal to the body tip (the first portion being distal from the body tip).
  • the outside surface of the body, in contact with the corresponding inside surface of the liner, is provided both in the first portion and in the second portion of the body.
  • the ducting system comprises one or more channels (or ducts) which interrupt the contact surface between the inside surface of the liner and the outside surface of the body; this contact surface is preferably provided also in the second portion of the body.
  • the ducting system is configured for generating or providing a circulation of fluid in the duct or ducts (i.e. in the channels), whereby a flow of refrigerating liquid flows through the ducts according to a predetermined flow path.
  • the outside surface of the body is grooved, so as to create a surface with multiple hollows acting in conjunction with a corresponding portion of an inside surface of the liner to delimit the ducting system.
  • the outside surface of the body also has non-hollowed contact or support zones where it is in contact with the liner. Thanks to the structure defined by the grooved body and the liner fitted round and supported by the body, it is possible for the liner to be made relatively thin, hence having low thermal resistance, thereby obtaining good cooling efficiency.
  • the ducting system comprises a plurality of grooves.
  • the grooves may be connected to each other in series or in parallel or partly in series and partly in parallel.
  • the outside surface of the body preferably includes a plurality of support zones where it is in contact with the inside surface of the liner; the support zones of the plurality of support zones are alternated with the grooves of the plurality of grooves.
  • each groove is interposed between a first and a second support zone of the plurality.
  • an entire portion of the outside surface of the body, not forming part of the hollowed surface, is in contact with the liner.
  • the entire outside surface that does not define the hollows defines a support zone between the liner and the body.
  • the ducting system defines at least one helix wound around the longitudinal axis.
  • the ducting system comprises a delivery duct for circulating the cooling fluid towards one end of the die and a return duct for circulating the cooling fluid returning from the end of the die.
  • the ducting system comprises one between the delivery duct and the return duct, while the other between the delivery duct and the return duct is formed inside the body of the die.
  • at least one between the delivery duct and the return duct defines a plurality of passages around the longitudinal axis.
  • at least one between the delivery duct and the return duct might have the shape of a coil, so that each curve defines a passage.
  • At least one between the delivery duct and the return duct has the shape of a helix, or spiral, wound around the longitudinal axis; thus, each coil of the helix defines a passage.
  • the delivery duct has the shape of a first helix wound around the longitudinal axis and the return duct has the shape of a second helix wound around the longitudinal axis; preferably, at least one coil of the first helix is interposed, along the longitudinal axis, between a first and a second coil of the second helix.
  • at least one coil of the second helix is interposed, along the longitudinal axis, between a first and a second coil of the first helix.
  • the ducting system might also comprise, or define, a plurality of delivery ducts and/or a plurality of return ducts.
  • a delivery duct formed in a longitudinal cavity of the body of the die, extending along the longitudinal axis
  • one or more return ducts might be defined in the ducting system between the body and the liner of the die.
  • the one or more return ducts may be defined by a helical groove, or by a plurality of grooves extending in parallel with the longitudinal axis and connected to each other in parallel.
  • the male element comprises a delivery manifold connected to the delivery duct and a return manifold connected to the return duct; the delivery manifold and the return manifold extend in parallel with the longitudinal axis.
  • the male element comprises a single delivery manifold and a single return manifold.
  • the delivery manifold and the return manifold are located inside the body: that is, they are defined by channels inside the body.
  • the male element comprises a support structure (or upper part), where the die is retractile - that is, mobile - relative to the support structure so it can move between a retracted position where, together with the support structure, it contributes to delimiting the forming cavity, and an extracted position, where it is configured for stretching the parison.
  • the die At the retracted position, the die is close to the support structure whereas, at the extracted position, it is spaced from the support structure. More specifically, the die is connected to the end of a rod (itself forming part of the male element) which is slidably inserted in the support structure.
  • a rod itself forming part of the male element
  • the mould comprises a male element according to one or more aspects of this disclosure.
  • the mould comprises a female element which is associable with the male element to delimit the forming cavity that forms the parison.
  • the mould also comprises a blow moulding cavity, associable with the male element instead of the female element to delimit a blow moulding cavity intended for the forming of a container from the parison.
  • the mould has (that is, is operable in) a forming configuration in which the male element is associated with the female element. In the forming configuration, the blow moulding cavity is spaced from the male element. In the embodiment in which there is a forming rod which is movable relative to the die, the stretching rod, in the forming configuration, is at the retracted position. In the embodiment in which the die is movable relative to the upper part of the male element, the die, in the forming configuration, is close to the upper part.
  • the mould has (that is, is operable in) a stretching and blow moulding configuration in which the male element is associated with the blow moulding cavity.
  • the female element In the stretching and blow moulding configuration, the female element is spaced from the male element.
  • the stretching rod In the embodiment in which there is a forming rod which is movable relative to the die, the stretching rod, in the stretching and blow moulding configuration, is at the extracted position.
  • the die In the embodiment in which the die is movable relative to the upper part of the male element, the die, in the stretching and blow moulding configuration, is extracted - that is, spaced from - the upper part.
  • This disclosure also provides a method for the forming and blow moulding of a parison.
  • the parison is formed by compression moulding; thus, the method preferably comprises a step of receiving a previously prepared charge of thermoplastic material in a mould and a step of forming the parison from the charge.
  • the parison might be formed by injection moulding or injection-compression moulding.
  • the parison is formed in a forming cavity delimited by a male element and a female element of the mould.
  • the male element comprises a die, which extends along a longitudinal axis, and a ducting system, located inside the die to allow a cooling fluid to flow in the male element.
  • the die comprises a body and a liner fitted round the body.
  • the liner has an outside surface, acting in conjunction with the female element of the mould to delimit the forming cavity, and an inside surface which is in contact with the outside surface of the body.
  • the ducting system is formed between the body and the liner. In other words, the ducting system is delimited by the outside surface of the body and the inside surface of the liner.
  • the method comprises a step of cooling the die by passing a cooling fluid through the ducting system.
  • the cooling fluid flows in a delivery duct towards one end of the die and in a return duct to flow back from the end of the die; preferably, at least one between the delivery duct and the return duct defines a plurality of passages around the longitudinal axis. More specifically, the delivery duct has the shape of a first helix wound around the longitudinal axis and/or the return duct has the shape of a second helix wound around the longitudinal axis.
  • FIG. 1A illustrates a mould according to one or more aspects of this disclosure, in a forming configuration
  • Figure 1 B illustrates the male element of the mould of Figure 1A with a stretching rod at the extracted position
  • Figure 3B illustrates the male element of the mould of Figure 3A with a die at the extracted position
  • Figure 4A illustrates the body of the male element of the mould of Figure 3A
  • Figure 4B illustrates the body of Figure 4A in a longitudinal cross section
  • Figure 5A illustrates a further embodiment of the body of the male element of the mould of Figure 3A;
  • Figure 5B illustrates the body of Figure 5A in a longitudinal cross section.
  • the numeral 10 denotes a mould.
  • the mould 10 comprises a male element 100 and a female element 200, movable between an open configuration, in which they are spaced apart, for receiving a charge, and a closed configuration, in which they are close together to delimit a forming cavity 20 for forming a parison from the charge.
  • the mould 10 also comprises a blow moulding cavity, not illustrated, associable with the male element 100 instead of the female element 200 to form a container from the parison.
  • the male element 100 comprises a die 110.
  • the die 110 extends along a longitudinal axis to an end 110A.
  • the die 110 juts from a remaining part of the male element 100 along the longitudinal axis A; thus, the die 110 forms a protrusion of the male element 100, configured to be inserted into the female element 200.
  • the die 110 comprises a body 112.
  • the die 110 also comprises a cooling circuit 114, configured to make the cooling fluid flow in the die 110.
  • the die 110 comprises a liner 116 fitted round the body 112. A ducting system 117 forming part of the cooling circuit 114 is formed between the liner 116 and the body 112.
  • the body 112 is inwardly curved in such a way as to have one or more hollowed surfaces, which, together with a corresponding portion of the liner 116, delimit the ducting system 117.
  • the body 112 also has nongrooved zones defining support surfaces 112A on which the liner 116 is supported. In other words, the liner 116 is in contact with the body 112 at the support surfaces 112A.
  • the cooling circuit 114 comprises a delivery duct 117A, 119 to guide the fluid to the proximity of the end 110A of the die 110, and a return duct 117B to guide the fluid returning from the end 110A of the die 110.
  • a delivery duct 117A, 119 and the return duct 117B has the shape of a helix wound around the longitudinal axis A.
  • the delivery duct 117A has the shape of a first helix wound around the longitudinal axis A and the return duct 117B has the shape of a second helix wound around the longitudinal axis A.
  • the first helix and the second helix are wound round each other, so at least one coil of the first helix is interposed between two consecutive coils of the second helix and at least one coil of the second helix is interposed between two consecutive coils of the first helix.
  • the helically shaped delivery duct 117A and return duct 117B are located in a zone of the die 110 whose cross section is converging towards the end 110A.
  • the cooling circuit 114 also comprises a delivery manifold 117A’, connected to the delivery duct 117A for bringing together the flow of cooling fluid, and a return manifold 117B’, connected to the return duct 117B to extract the cooling fluid therefrom.
  • the delivery manifold 117A’ and the return manifold 117B’ run parallel to the longitudinal axis A’.
  • the cooling fluid flows down the delivery manifold 117A’ and along the delivery duct 117A to the proximity of the end 110A of the die 110, then along the return duct 117B and up the return manifold 117B’.
  • the ducting system 117 between the body 112 and the liner 116 defines the delivery duct 117A and the return duct 117B for the cooling fluid.
  • a support surface 112A is defined between each coil of the delivery duct 117A and the adjacent coil of the return duct 117B.
  • the central delivery duct 119 is formed in a cavity inside the die, extending along the longitudinal axis A, and the return duct 117B is defined by the ducting system 117 between the body 112 and the liner 116.
  • the cooling fluid flows down inside the body 112 through the central delivery duct 119 and flows back up through the return duct 117B between the body 112 and the liner 116.
  • the return duct 117B formed between the body 112 and the liner 116 may be spiral - that is, helical - in shape.
  • the ducting system 117 defines a plurality of coils around the longitudinal axis A.
  • the ducting system 117 includes a plurality of passages which are connected to each other in series.
  • a non-hollowed support surface 112A, where the body 112 is in contact with the liner 116, is defined between each coil and the next.
  • the return duct 117B formed between the body 112 and the liner 116 may be defined by a plurality of grooves extending along the longitudinal axis A. These grooves are connected to each other in parallel. In this case, therefore, the ducting system 117 includes a plurality of passages which are connected to each other in parallel.
  • both the delivery duct and the return duct may include a plurality of grooves extending along the longitudinal axis and connected to each other in parallel.
  • the delivery duct is defined by a helical ducting system between body and liner, whilst the return duct is formed in a cavity inside the body of the die.
  • one between the delivery duct and the return duct is formed in an internal cavity inside the body of the die and the other between the delivery duct and the return duct is defined by a coil formed between body and liner; the coil might be made up of a plurality of grooves extending along the longitudinal axis and connected to each other in series.
  • the die 110 has a socket 111 , or recess, at its longitudinal end 110A.
  • the die 110 inside it, has a longitudinal cavity 113, extending along the longitudinal axis A.
  • the longitudinal cavity 113 is formed in the body 112 of the die 110.
  • the longitudinal cavity 113 communicates with - that is, opens onto - the socket 111.
  • the male element 100 also comprises a stretching rod 120 which is slidably inserted in the longitudinal cavity 113.
  • the stretching rod 120 has an elongate body extending along the longitudinal axis A and a terminal portion 121 connected to one end of the elongate body.
  • the terminal portion 121 is wider than the elongate body.
  • the longitudinal cross section of the terminal portion 121 becomes progressively wider away from the elongate body.
  • the stretching rod 120 is movable between a retracted configuration, in which the elongate body is inserted in the longitudinal cavity 113 and the terminal portion 121 is inserted in the socket 111 , and an extracted position, in which the elongate body is partly extracted from the longitudinal cavity 113 and the terminal portion 121 is extracted from the socket 111.
  • the terminal portion 121 is larger in cross section than the longitudinal cavity 113 so it cannot enter the longitudinal cavity 113.
  • the terminal portion 121 has a flared shape. This embodiment is illustrated by way of an example in Figures 1 A and 1 B.
  • the die 110 acts in conjunction with the female element 200 and with the terminal portion 121 of the stretching rod to form a bottom and a side wall of the parison, while the support structure 150 acts in conjunction with the female element 200 to form the neck of the parison.
  • the stretching rod 120 is spaced from the wall of the body 112 defining the longitudinal cavity 113.
  • the gap 115 has a tubular shape around the stretching rod 120.
  • the gap 115 is wider in a zone far from the end 110A of the die 110 and narrower in a zone close to the end 110A of the die 110.
  • the gap 115 is configured to channel the air flow used for blow moulding the parison. In effect, once it has been formed, the parison is blow moulded to make a container.
  • the gap 115 runs along the longitudinal axis A as far as the socket 111 , where it has an outlet 115A through which the blow moulding air is emitted.
  • the terminal portion 121 occludes the outlet 115A; when the stretching rod 120 is at the extracted position, the outlet 115A is open to allow the blow moulding air to flow out of the gap 115.
  • both the delivery duct 117A and the return duct 117B of the cooling circuit 114 are defined by the ducting system 117 between the body 112 and the liner 116. In effect, it would not be easy to form the ducts inside the body 112 of the die 110 since it contains the cavity 113 for the stretching rod 120.
  • the die 110 is movable relative to a support structure (or upper part) 150 of the male element 100.
  • the support structure 150 has a cavity that extends along the longitudinal axis A; the male element 100 also comprises a rod 151 which is slidably inserted in the longitudinal cavity of the support structure 150.
  • the rod 151 has one end fixed to the die 110.
  • the die 110 is movable relative to the support structure 150 between a retracted position, where it is in contact with the support structure 150 in order to form the parison, and an extracted position, where it is spaced from the support structure 150 in order to stretch the parison.
  • the forming cavity 20 is delimited by the female element 200, the die 110 and the support structure 150. More specifically, in this embodiment, the die 110 acts in conjunction with the female element 200 to form a bottom and a side wall of the parison, while the support structure 150 acts in conjunction with the female element 200 to form the neck of the parison.
  • This embodiment might comprise a blow moulding air duct, not illustrated, inside the rod 151 and the body 112 of the die 110.
  • the blow moulding air may be channelled by a gap between the rod 151 and the support structure 150.
  • the cooling circuit 114 includes the central delivery duct 119 inside the die 110 and the return duct 117B between the body 112 and the liner 116.
  • the delivery duct might be defined between the body and the liner might be inside the die.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Abstract

Un élément mâle (100) d'un moule (10) pour le moulage par compression d'une paraison comprend une matrice (110) et un système de canalisation (117), situé à l'intérieur de la matrice (110) pour permettre à un fluide de refroidissement de s'écouler dans l'élément mâle (100), la matrice (110) comprenant : un corps (112); une doublure (116) ajusté autour du corps (112) et ayant une surface extérieure, agissant conjointement avec un élément femelle (200) du moule (10) pour délimiter une cavité de formage (20), et une surface intérieure en contact avec la surface extérieure du corps (112), le système de canalisation (117) étant formé entre le corps (112) et la doublure (116).
EP21806404.6A 2020-11-10 2021-11-09 Élément mâle d'un moule Pending EP4244034A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT202000026873 2020-11-10
PCT/IB2021/060359 WO2022101778A1 (fr) 2020-11-10 2021-11-09 Élément mâle d'un moule

Publications (1)

Publication Number Publication Date
EP4244034A1 true EP4244034A1 (fr) 2023-09-20

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP21806404.6A Pending EP4244034A1 (fr) 2020-11-10 2021-11-09 Élément mâle d'un moule

Country Status (6)

Country Link
US (1) US20240017450A1 (fr)
EP (1) EP4244034A1 (fr)
JP (1) JP2023547700A (fr)
CN (1) CN116457177A (fr)
TW (1) TW202224909A (fr)
WO (1) WO2022101778A1 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMO20060089A1 (it) * 2006-03-17 2007-09-18 Sacmi Apparati e metodi
JP5644173B2 (ja) * 2010-04-23 2014-12-24 東洋製罐株式会社 圧縮成形装置及び圧縮成形方法
DE102018132332A1 (de) * 2018-12-14 2020-06-18 Mht Mold & Hotrunner Technology Ag Kernkühlsystem für einen Formkern eines Spritzgießwerkzeuges

Also Published As

Publication number Publication date
JP2023547700A (ja) 2023-11-13
US20240017450A1 (en) 2024-01-18
WO2022101778A1 (fr) 2022-05-19
CN116457177A (zh) 2023-07-18
TW202224909A (zh) 2022-07-01

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